Large Extra Dimensions, Sterile neutrinos and Solar Neutrino Data

Abstract

Solar, atmospheric and LSND neutrino oscillation results require a light sterile neutrino, $ν_B$, which can exist in the bulk of extra dimensions. Solar $ν_e$, confined to the brane, can oscillate in the vacuum to the zero mode of $ν_B$ and via successive MSW transitions to Kaluza-Klein states of $ν_B$. This new way to fit solar data is provided by both low and intermediate string scale models. From average rates seen in the three types of solar experiments, the Super-Kamiokande spectrum is predicted with 73% probability, but dips characteristic of the 0.06 mm extra dimension should be seen in the SNO spectrum.